FYI,
SWE Common can serve to send very efficiently packaged datasets (binary,
compressed binary) just like NetCDF does while providing robust metadata
describing the datasets.
These datasets can be N-D grid coverages, discrete coverages, or any other kind
of sensor observations or model results.
The point for us to build SWE Common rather than just reusing NetCDF was to
support efficient random access in huge datasets and real time streaming data
(which NetCDF is not designed for) with a single model.
Both cases are supported and I am pretty sure we can generate a SWE Common
encoded binary stream that is byte-to-byte compatible with the data section of
a NetCDF file.
Developing a module for the NetCDF API dealing with SWE Common would be quite
trivial thanks to the harmonization work we have already done.
Regards,
-------------------------------------------------
Alexandre Robin
Spot Image, Web and E-Business
Tel: +33 (0)5 62 19 43 62
Fax: +33 (0)5 62 19 43 43
http://www.spotimage.com <http://www.spotimage.com>
Before printing, think about the environment
________________________________
De : Robin, Alexandre
Envoyé : jeudi 20 août 2009 10:01
À : 'Max Martinez'; Ben Domenico; Peter Baumann
Cc : Unidata Techies; Unidata GALEON; wcs-2.0.swg; 'Carl Reed'
Objet : RE: [WCS-2.0.swg] CF-netCDF standards initiatives
Ben,
I hope we don't have to define a NEW standard but rather work with you to see
how we can treat your use cases with SWE Common (which already incorporates
some NetCDF concepts and is VERY close to NcML).
I already looked at the issue and writing a converter (even the 'on the fly'
kind) between the two formats should be no problem at all.
Bringing legacy formats (be them pseudo-defacto standards of a community) into
OGC is NOT going to help interoperability across domains...
Regards,
-------------------------------------------------
Alexandre Robin
Spot Image, Web and E-Business
Tel: +33 (0)5 62 19 43 62
Fax: +33 (0)5 62 19 43 43
http://www.spotimage.com <http://www.spotimage.com>
Before printing, think about the environment
________________________________
De : wcs-2.0.swg-bounces+alexandre.robin=spotimage.fr@xxxxxxxxxxxxxxxxxxxxxxxx
[mailto:wcs-2.0.swg-bounces+alexandre.robin=spotimage.fr@xxxxxxxxxxxxxxxxxxxxxxxx]
De la part de Max Martinez
Envoyé : jeudi 20 août 2009 03:19
À : Ben Domenico; Peter Baumann
Cc : Unidata Techies; Unidata GALEON; wcs-2.0.swg
Objet : Re: [WCS-2.0.swg] CF-netCDF standards initiatives
Ben,
What exactly is an "OGC binary encoding standard"? Is CF-netCDF attempting to
be the first of its kind or are there other examples?
Max
________________________________
From: wcs-2.0.swg-bounces+max.martinez=erdas.com@xxxxxxxxxxxxxxxxxxxxxxxx
[mailto:wcs-2.0.swg-bounces+max.martinez=erdas.com@xxxxxxxxxxxxxxxxxxxxxxxx] On
Behalf Of Ben Domenico
Sent: Wednesday, August 19, 2009 1:19 PM
To: Peter Baumann
Cc: Unidata Techies; Unidata GALEON; wcs-2.0.swg
Subject: [WCS-2.0.swg] CF-netCDF standards initiatives
Hello,
Some confusion has resulted from the fact that we are pursuing two parallel
efforts at standardizing CF-netCDF within the OGC.
The first initiative began a few years ago. The goal is to establish CF-netCDF
as an extension standard for WCS encoding of data in binary form. Stefano
Nativi just sent out an email announcing the latest revision of the proposed
"discussion paper" on that topic. This will be discussed and hopefully voted
on at the September/October TC meeting.
At the same time, we have a new initiative to establish CF-netCDF as a separate
OGC binary encoding standard. This approach will result in a binary
encoding which can be used with different access protocols, e.g., WFS or SOS as
well as WCS. Of course, in the long run, our objective is to tie the two
approaches together, but we do not want to impede progress on either right now
by making them formally interdependent. A very rough draft of the core
standard for CF-netCDF is on the GALEON wiki at:
http://sites.google.com/site/galeonteam/Home/cf-netcdf-candidate-standard
As you can see, the draft for the OGC core is based on the NASA Earth Science
Data System standard (NASA ESDS-RFC-011v1.00). We hope to have this candidate
standard in the proper OGC template form by the September/October TC and will
have an ad-hoc session at which we plan to establish a SWG. Since there is
already a large community of practice, endorsement by other standards groups
(NASA and NOAA in the US), and solid reference implementations, we hope to move
forward quickly with this standard.
We would very much like to have as many liaisons as possible between the WCS
and CF-netCDF working groups to ensure that they are kept in harmony.
-- Ben
